@article{TMF_1997_110_3_a0,
     author = {I. Z. Golubchik and V. V. Sokolov},
     title = {On some generalizations of the factorization method},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {339--350},
     year = {1997},
     volume = {110},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1997_110_3_a0/}
}